1) Most scholars believe he is an actual person, but it’s also possible that he establishes a system of deception before the reappearance of the Imam.
We have very little hadiths about the Dajjal in our Shia Hadith sources. Hence, we cannot verify those that make claims he will perform miracles. It’s possible that he uses deception to trick the people.
2) No it is not right to call every new technology as dajjal.
Dajjal is a person who leads a deceptive system. Anything that’s haram falls under the deceptive system. A lot of new technology has good usages.